However, I have run into problems. My map is a little over medium size, but not huge. I am using some terrain brushes ADDED not SUBTRACTED using the idea from Rime Island.
When I try to subtract tunnels into the mountains of the terrain, errors appear on the map far from the changes. The terrain I am tunneling is 18 by 18 so I don't feel like I am stressing out the engine. Is this a common problem or am I doing something wrong?
That seemed to work pretty good for me. How many segments do you have (sometimes too complex terrain brushes didn't work too well for me....and when you made your terrain brush ...Did you keep all the vertices on a grid point (even if the scale is 1 instead of 16. Just on a grid point somewhere?
I just tried to always keep cuts on the unreal unit grid. There are other people here who probably have better insight as to why these happen etc. It's been a while for me.
Also i think zone portals sometimes cause these. I'll let the better mappers chime in from here. I'm just trying to remember things as best i can. Best of luck to you and I'm sure the good people here will help you figure it out.
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The problem you have could be caused by a number of things? Terrains are usually complex so there's a chance yours is causing this issue, but BSP holes can be caused by any brush, even normal ones in a bad place. It's impossible to diagnose the cause of your trouble.
I don't know what's your skill level but in any case, here's an explanation of what's going on:
What you have is probably a BSP Hole, a hole in your geometry caused by a combination of complex or erroneous geometry (more on that later) and the way the engine builds the map as a series of triangles. You can learn about them here (your hole would fall under the 5th category listed in the beginning).
We really need a definitive document on holes and their fixes.